Senior Mobile Developer

Senior Mobile Developer — B2B Contract | Warsaw | Start Immediately

The Opportunity

This is a senior-level position. Candidates must have a proven track record of building and shipping production mobile applications for iOS and Android. You should be able to demonstrate live applications in the App Store or Google Play, or provide clear evidence of equivalent commercial applications where public links are unavailable.

We are looking for a hands-on Senior Mobile Developer to take ownership of our mobile application, deliver production-ready features, and work directly with the CEO alongside an experienced .NET backend team.

The role starts as a B2B contract, with genuine long-term potential to grow into mobile architecture ownership, technical leadership, and team management as the product and engineering team expand.

What You’ll Build

• Production-ready mobile applications for both iOS and Android

• Secure customer access and Bluetooth Low Energy functionality for opening storage units

• Integration with the company’s .NET/C# APIs and operational systems

• Mobile flows for customer accounts, rentals, payments, and access management

• Mobile architecture, testing, CI/CD, monitoring, and App Store / Google Play releases

• Close collaboration with the CEO and core engineering team, with fast decision-making and minimal bureaucracy

Nice to Have (Not must)

• Experience working with .NET / C# backend systems

• Familiarity with CRM, CMS, or operational platforms

• Experience with access control, IoT devices, smart locks, or hardware integrations

• Experience mentoring developers or growing into a technical leadership role

What You Bring

• Proven track record: Live mobile applications currently in production with App Store, Google Play, or portfolio links

• Strong level commercial mobile development experience

• Experience integrating APIs into production mobile applications

• Knowledge of authentication, permissions, push notifications, mobile security, and Bluetooth Low Energy (BLE)

• Ability to work independently and deliver high-quality software

What's In It for You

• $6,000/month (B2B Contract)

• + Relocation bonus for candidates moving to Warsaw

• + Rewarding Milestone bonuses for product deliveries

• OnSite New Modern office in Warsaw

• Direct access to the CEO

• Fast-moving environment with minimal bureaucracy

• Long-term career growth as the engineering team expands

Applications without proof of shipped production apps will not be considered.

Start immediately.

Interview process takes days, not weeks.